Offtake Flue Patents (Class 122/421)
  • Patent number: 10415889
    Abstract: A gas cooler includes a pair of seal plates and a pair of first support ribs. The individual seal plate has a stepped surface which extends in a direction that a cooling portion is inserted into a casing. The individual first support rib supports the stepped surface. With the configuration where the stepped surface is supported by the first support rib, the inside of the casing is partitioned into an upstream-side space communicated with an introducing port and a downstream-side space communicated with a discharging port.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: September 17, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Yusuke Tomioka, Kazuya Hirata, Koji Hagihara, Yasuto Kataoka
  • Patent number: 10227900
    Abstract: The purpose of the present invention is to decrease the loss of energy of flue gas when superheated steam is cooled and prevent heat efficiency from being decreased. A boiler is provided with: economizers (a medium-pressure economizer (13) and a high-pressure secondary economizer (18)) which heat water supplied by water supply pumps (a medium-pressure water supply pump (27) and a high-pressure water supply pump (28)); evaporators (a medium-pressure evaporator (16) and a high-pressure evaporator (21)) which evaporate the water that is heated by the economizers; and cooling devices (a medium-pressure system and a high-pressure system) which mix water, as a coolant, which has passed through the economizers via the water supply pumps with steam.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: March 12, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventor: Jun Taguchi
  • Patent number: 10197266
    Abstract: A boiler system and methods for heating a fluid are disclosed, in particular for heating water for producing steam. The boiler comprises an economizer module integrated on the top of a furnace, and is in communication with the furnace to receive heat and/or hot combustion gases therefrom. The economizer comprises tubes receiving the fluid, such as feedwater, to be pre-heated and providing it to the furnace comprising a combustion chamber producing heat and hot combustion gases. The fluid is pre-heated by circulating first through the pre-heating tube assembly of the economizer module before entering the furnace module where the fluid is further heated by the combustion chamber. Since the economizer is located on the furnace module, the boiler does not have a large footprint compared to a regular boiler system without an economizer. Due to the total integration of the economizer with the furnace, the boiler system has improved energy efficiency.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: February 5, 2019
    Assignee: Thermodesign, Inc.
    Inventor: Réjean Gauthier
  • Patent number: 9851101
    Abstract: A boiler system is provided including: a boiler that burns fuel containing sulfur content, chlorine content, and water content to generate a combustion gas; a bagfilter that removes sulfur oxide; a denitration section that removes nitrogen oxide; a desulfurizing absorbent supply section that mixes a desulfurizing absorbent into the combustion gas on an upstream side of the bagfilter; and a reformer that mixes a denitrating reagent into the combustion gas on an upstream side of the denitration section, wherein the bagfilter performs dry desulfurization, and a temperature of the combustion gas passing through the bagfilter and flowing into the denitration section is higher than 200° C. and 350° C. or lower, and the combustion gas from which the sulfur oxide has been removed by the bagfilter flows into the denitration section without being heated on the upstream side of the denitration section.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: December 26, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Tomotsugu Masuda, Masashi Kiyosawa
  • Patent number: 9739476
    Abstract: A heat exchanger apparatus for receiving water from a steam drum (1) and providing steam and heated unevaporated liquid water to the steam drum includes a first evaporator (EVAP-1) and a second evaporator (EVAP-2). The first evaporator can receive water from a steam drum via a first feed conduit (9) and the second evaporator can receive water from a second feed conduit (11). Both evaporators can output heated fluid to the steam drum via a combined evaporator output conduit (13). Each first evaporator passageway (14) only makes a single pass through a gas duct (15) having a heated gas flow (7) passing therethrough while each second evaporator passageways (24) can make one or more passes through the gas duct for transferring heat from the gas to the fluid within the evaporators. A portion of the first feed conduit can also have a pre-specified volume a pre-specified height below the first inlet (10).
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: August 22, 2017
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Suresh K. Shenoy, Jay Brian Anderson, Rahul J. Terdalkar, Donald William Bairley
  • Patent number: 9567875
    Abstract: A power generation apparatus, a power generation method, a decomposition-gas boiler, and a decomposition-gas turbine with which nitrous oxide may be used as an environmentally friendly energy source. A fuel gas including nitrous oxide (N2O) is supplied to a decomposition reactor (22) in which a catalyst (21) for decomposing nitrous oxide is disposed. Steam is generated by a decomposition-gas boiler by heat recovery from decomposition gas (N2, O2) generated by decomposing the nitrous oxide, the steam generated by the decomposition-gas boiler is used to drive the rotation of a steam turbine to obtain motive power, and the motive power is subsequently used to drive a generator to obtain electrical power. Alternatively, the decomposition gas (N2, O2) generated by decomposing the nitrous oxide is used to drive the rotation of a decomposition-gas turbine to obtain motive power.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: February 14, 2017
    Assignee: SHOWA DENKO K.K.
    Inventors: Shigehiro Chaen, Junichiro Kawaguchi, Hiroto Habu, Yoshitsugu Sone
  • Publication number: 20150053152
    Abstract: A boiler comprises a boiler gas exhaust providing an exhaust for recuperated gases; and a secondary heat exchanger comprising: an economizer cold fluid inlet connected to a source of cold fluid; an economizer cold fluid outlet fluidly connected to the economizer cold fluid inlet and located thereabove, the cold fluid circulating upwardly from the economizer cold fluid inlet towards the economizer cold fluid outlet; a hot gas inlet for receiving the recuperated gases from the boiler gas exhaust; and a hot gas outlet fluidly connected to the hot gas inlet through the secondary heat exchanger, the recuperated gases circulating from the hot gas inlet toward the hot gas outlet; wherein the recuperated gases cross the secondary heat exchanger and exhaust by the hot gas outlet, the cold fluid being heated between the economizer cold fluid inlet and the economizer cold fluid outlet thereby resulting in a preheated fluid.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 26, 2015
    Inventor: Alexandre Lapierre
  • Patent number: 8955466
    Abstract: A system providing for heat recovery from exhausted flue gas in a steam generator is described comprising a flue gas outlet conduit defining a flow path for flue gas from a flue gas outlet of a steam generator to a flue gas conduit junction point; a flue gas primary conduit defining a flow path for flue gas from the junction to a primary air preheater; a flue gas secondary conduit defining a flow path for flue gas from the junction to a secondary air preheater; wherein a steam generator process fluid heat exchanger is disposed within the flow path of the flue gas primary conduit upstream of the primary air preheater to recover some heat from the flue gas in advance of the primary air preheater. A method implementing the flow principles embodied in such a system is also described.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: February 17, 2015
    Assignee: Doosan Babcock Energy America
    Inventor: Rupert Mark Harrison
  • Patent number: 8904790
    Abstract: The disclosure provides an M-type pulverized coal boiler suitable for ultrahigh steam temperature. The pulverized coal boiler comprises a hearth of which the bottom is provided with a slag hole and a tail downward flue of which the lower part is provided with a flue gas outlet. The pulverized coal boiler further comprises a middle flue communicated between the hearth and the tail downward flue, wherein the middle flue comprises an upward flue and a hearth outlet downward flue of which the bottoms are mutually communicated and the upper ends are respectively communicated with the upper end of the hearth and the upper end of the tail downward flue to form a U-shaped circulation channel.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: December 9, 2014
    Assignee: Huaneng Clean Energy Research Institute
    Inventors: Minhua Jiang, Ping Xiao, Jianzhong Jiang, Li Zhong
  • Publication number: 20140262257
    Abstract: A small supercritical once-through steam generator (OTSG) includes a radiant section with a furnace coil, and a convection section downstream of the radiant section that includes a superheater which is fluidically connected to the furnace coil. Optionally, the OTSG is devoid of a steam separator. An economizer can also be included downstream of the superheater. Supercritical steam can be generated using the OTSG, for use, among other things, in enhanced oil recovery applications.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Inventors: Michael A. Costanzo, James S. Bloss
  • Publication number: 20140260285
    Abstract: Systems and methods for the design of a heat recovery steam generator (HRSG) or similar system that is designed to extract heat from hot gases flowing through a duct which utilizes an external liquid-to-liquid heat exchanger for preheating feedwater. The systems and methods allow for multiple water flow patterns to adjust the temperature of the feedwater into the gas duct.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Inventor: Yuri Rechtman
  • Publication number: 20140260286
    Abstract: A heat recovery steam generator (HRSG) (10) including: an economizer (12) configured to heat a working fluid by extracting heat from a flow of flue gas (20). The HRSG includes a diluting fluid injector arrangement (60) configured to inject a diluting fluid (50) effective to dilute a concentration of a gaseous corrosive when compared to an undiluted concentration of the gaseous corrosive in the flow of flue gas. The HRSG also includes a preheater (18) configured to preheat the diluting fluid prior to injection.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Inventors: Zaher El Zahab, Gerald J. Feller
  • Publication number: 20140033712
    Abstract: The disclosure provides an M-type pulverized coal boiler suitable for ultrahigh steam temperature. The pulverized coal boiler comprises a hearth of which the bottom is provided with a slag hole and a tail downward flue of which the lower part is provided with a flue gas outlet. The pulverized coal boiler further comprises a middle flue communicated between the hearth and the tail downward flue, wherein the middle flue comprises an upward flue and a hearth outlet downward flue of which the bottoms are mutually communicated and the upper ends are respectively communicated with the upper end of the hearth and the upper end of the tail downward flue to form a U-shaped circulation channel.
    Type: Application
    Filed: November 11, 2011
    Publication date: February 6, 2014
    Applicant: HUANENG CLEAN ENERGY RESEARCH INSTITUTE
    Inventors: Minhua Jiang, Ping Xiao, Jianzhong Jiang, Li Zhong
  • Publication number: 20140007823
    Abstract: A heating system for heating heat-transfer oil using exhaust heat of boiler flue gas. The system includes: a flue, an economizer, an air preheater, and a heat-transfer oil heater. The economizer and the air preheater are disposed in the flue along the flow direction of the flue gas. The heat-transfer oil heater is disposed inside the flue in front of the economizer and is connected to a heat consumption device via a first circulating pipe. The circulating pipe is equipped with a circulating pump.
    Type: Application
    Filed: September 16, 2013
    Publication date: January 9, 2014
    Applicant: SHANGHAI FUBO EP EQUIPMENT CO., LTD.
    Inventors: Xuelve QIAN, Bing LIU
  • Publication number: 20130284120
    Abstract: A circulating fluidized bed boiler including a furnace for combusting solid carbonaceous fuel in a fast fluidized bed, the furnace having walls made of water/steam tube panels and used for evaporating water fed therein. A solids separator arranged adjacent to a sidewall of the furnace separates solids entrained with exhaust gas discharged via an outlet channel from an upper portion of the furnace. A gas seal conveys at least a portion of the separated solids to a first fluidized bed heat exchange changer arranged downstream of the gas seal and has internal heat exchange surfaces. A first lift channel has a lower end connected to a bottom portion of the first fluidized bed heat exchanger chamber and an upper end connected to an upper end of a first return channel for discharging solids from the first fluidized bed heat exchange chamber and for taking the cooled solids to a lower portion of the furnace.
    Type: Application
    Filed: February 22, 2012
    Publication date: October 31, 2013
    Inventors: Kari Kauppinen, Pertti Kinnunen
  • Publication number: 20130239909
    Abstract: The disclosure provides an arrangement structure suitable for an inverted pulverized coal boiler with ultra-high steam temperature steam parameters, including a hearth, wherein the hearth is communicated with a middle uplink flue, and the top of the middle uplink flue is communicated with that of a tail downlink flue.
    Type: Application
    Filed: November 18, 2011
    Publication date: September 19, 2013
    Applicant: HUANENG CLEAN ENERGY RESEARCH INSTITUTE
    Inventors: Minhua Jiang, Ping Xiao, Jianzhong Jiang, Li Zhong
  • Publication number: 20130213489
    Abstract: A method for producing process vapor and boiler feed steam in a heatable reforming reactor for producing synthesis gas. The sensible heat of a synthesis gas produced from hydrocarbons and steam can be used so that two types of vapor are produced during the heating and evaporation of boiler feed water and process condensate. The method also includes a conversion of the carbon monoxide contained in the synthesis gas. The method includes an optional heating of the boiler feed water using the flue gas from the heating of the reforming reactor. The sensible heat of the synthesis gas and of the flue gas originating from the heating can be used more efficiently. The disadvantages from the flue gas heating, which are caused by the fluctuating heat supply in the flue gas duct, are avoided. A system for practicing the method is also disclosed.
    Type: Application
    Filed: August 20, 2011
    Publication date: August 22, 2013
    Applicant: THYSSENKRUPP UHDE GMBH
    Inventors: Thilo Von Trotha, Jan Heinrich
  • Publication number: 20130192542
    Abstract: An apparatus for using a water coil air heater with a single bank economizer. A boiler economizer arrangement includes an economizer bank which has separate hot pass bank and cold pass bank economizer portions in a parallel arrangement, each facing the same flow of hot flue gas. Feedwater enters the cold pass bank economizer where it is heated by the hot flue gas, and then flows to a water coil air heater away from the hot flue gas. The feedwater dissipates heat energy in the water coil air heater which may be used to heat air bound for combustion. The feedwater continues into the hot pass bank economizer portion of the economizer arrangement where it absorbs additional heat from the flue gas. The heated feedwater flows out of the economizer arrangement and may be subject to additional heating by a boiler or other heat exchanger.
    Type: Application
    Filed: January 30, 2013
    Publication date: August 1, 2013
    Applicant: BABCOCK & WILCOX POWER GENERATION GROUP, INC.
    Inventor: Babcock & Wilcox Power Generation Group, Inc.
  • Publication number: 20130118422
    Abstract: The present document describes a system for installation on a boiler for providing energy to a deaerator comprising: a heat exchanger for positioning at an exhaust of the boiler and for connecting to the deaerator for decreasing combustion gases temperature from a temperature T1 to a temperature T2 before evacuation of the combustion gases to atmosphere for providing energy to the feedwater and the deaerator.
    Type: Application
    Filed: November 6, 2012
    Publication date: May 16, 2013
    Inventor: Simon Mandeville
  • Publication number: 20130104815
    Abstract: Disclosed is an economizer including a plurality of coil stacks. Each coil stack includes a tube coiled such that adjacent layers of the tube contact one another in a radial direction. Further, the coil stacks are axially spaced from one another to allow exhaust to flow between adjacent coil stacks.
    Type: Application
    Filed: October 25, 2012
    Publication date: May 2, 2013
    Applicant: ENERPRO INC.
    Inventor: Seyed Jafar Mirjalali
  • Patent number: 8091514
    Abstract: An energy re-claimer is provided for preheating water prior to the water entering a conventional residential, commercial or industrial gas water heater. The energy re-claimer is mounted on top of the water heater between the draft diverter and the hot air flue. The energy re-claimer is preferably a double wall construction that is larger in diameter than the draft diverter and hot air flue in order to allow normal passage of hot air through the system; however, a single wall construction may also be used. Tap water enters a pipe inside the double wall construction and is heated prior to being directed through the water heater. The pipe may be constructed of a number of straight lengths connected by returns or may be in the form of a single straight section connected to a coil made of connected curving sections that surround the axis of the energy re-claimer.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: January 10, 2012
    Inventor: Jesus Martinez Jimenez
  • Publication number: 20100212610
    Abstract: A system providing for heat recovery from exhausted flue gas in a steam generator is described comprising a flue gas outlet conduit defining a flow path for flue gas from a flue gas outlet of a steam generator to a flue gas conduit junction point; a flue gas primary conduit defining a flow path for flue gas from the junction to a primary air preheater; a flue gas secondary conduit defining a flow path for flue gas from the junction to a secondary air preheater; wherein a steam generator process fluid heat exchanger is disposed within the flow path of the flue gas primary conduit upstream of the primary air preheater to recover some heat from the flue gas in advance of the primary air preheater. A method implementing the flow principles embodied in such a system is also described.
    Type: Application
    Filed: February 26, 2009
    Publication date: August 26, 2010
    Inventor: Rupert Mark Harrison
  • Publication number: 20100212607
    Abstract: An energy recovery device particularly for heating or industrial systems that entail the combustion of products, comprising a tubular element, which is arranged at a flue or stack and has a coil which is perforated along its extension. The coil is connected to a delivery tube for the treatment water for scrubbing the exhaust gases. The tubular element has an outlet for collecting the treatment water, which can be conveyed to a recuperator/heat exchanger. The device makes it possible to reduce the emission of particulates and pollutants into the environment and reduces the temperature of the exhaust gases besides allowing heat energy recovery.
    Type: Application
    Filed: February 19, 2010
    Publication date: August 26, 2010
    Inventors: Giorgio Eberle, Massimo Mazzega
  • Patent number: 7415944
    Abstract: A heat exchanger comprising: gas flow path means for defining a flow path for flue gases from a boiler; liquid flow path means for defining a flow path for a liquid through the heat exchanger; and heat transfer means for transferring heat from the gas in the gas flow path means to the liquid in the liquid flow path means, wherein the heat transfer means forms a first thermal store.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: August 26, 2008
    Inventor: Christopher Charles Farrell
  • Patent number: 6799538
    Abstract: An environmentally-friendly heating apparatus which can collect and recover heat of exhaust gas discharged from a boiler in order to use the heat for heating an indoor space. The heating apparatus filters the exhaust gas, using a mist filter formed by vapor generated in a flue, thereby minimizing the quantity of exhaust fumes containing noxious substances.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: October 5, 2004
    Inventor: Jung-soo Lim
  • Patent number: 6564755
    Abstract: A heat recovery system includes a heat exchanger surrounding a flue pipe from a furnace for preheating water. The heat exchanger includes a sleeve surrounding the flue pipe to define an annular space and form a water jacket in direct contact with the flue pipe. Several water storage tanks are connected in series and mounted around the sleeve to absorb heat from the water jacket. The outer water tanks are connected to one end of the water jacket at the downstream end of the flue pipe so that water is carried sequentially through each of the water tanks and through the water jacket surrounding the flue pipe. Typically, the water jacket includes a plurality of baffles to define a tortuous path through the water jacket. A conduit for supplying water to the outer water tanks can be wrapped around the downstream end of the flue pipe in a spiral manner to preheat the water prior to feeding to the water tanks.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: May 20, 2003
    Inventor: Thomas I. Whelan
  • Patent number: 6145139
    Abstract: An improved swimming pool/spa water heating system whereby a portion of the water flow into the main heater unit (3), is preheated, thereby decreasing the time of operation of the main heater unit (3), to raise the pool water temperature to the desired temperature. The system improvement includes an arrangement wherein pool water is drawn from the pool by the water pump (22), and a portion of the water is diverted through a supplementary heater unit (27), which is located in the combustion exhaust stream of the main heating unit (3). The diverted water is thus preheated in the supplementary heater unit (27), by the residual heat in the main heater unit exhaust and is then directed back into the water system, at a point prior to the inlet of the main heater unit (3), and mixes with the remaining water in the system, thereby increasing the temperature of water into the main heater unit (3).
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: November 14, 2000
    Inventor: Stephen P. Bonn
  • Patent number: 5769156
    Abstract: An otherwise conventional recovery boiler for burning black liquor requires less capital investment and takes up less space by constructing the economizers in a particular manner. At least first and second economizers are provided for preheating feed water utilizing flue gas from combustion of the black liquor. The economizers are positioned substantially side-by-side, in the width dimension of the recovery boiler furnace, and connected in such a way that flue gas leaving the first economizer passes in a substantially transverse horizontal direction and then through a substantially vertical intra-economizer flow channel into the second economizer. A boiler bank may be connected between the superheater section of the recovery boiler and the first economizer, and any number of economizers may be utilized.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: June 23, 1998
    Assignee: Ahlstrom Machinery Oy
    Inventor: Jan Storbacka
  • Patent number: 5765509
    Abstract: A mixed-pressure waste-heat boiler (7) has a forced-flow steam generator, essentially composed of a low-pressure economizer (15), of a low-pressure drum (17) and of a low-pressure evaporator (16), and a once-through forced-flow steam generator, essentially composed of a high-pressure economizer (21), of a high-pressure evaporator (22) and of a high-pressure superheater (23). The high-pressure economizer (21) is fed from the steam drum (17) of the forced-circulation steam generator via a high-pressure feed pump (20). Arranged between the high-pressure evaporator (22) and high-pressure superheater (23) is a separation bottle (25) which is connected to the steam drum (17) via a recirculation line (26). During startup, until superheated conditions are reached at the outlet of the high-pressure evaporator (22), high-pressure saturated water is recirculated into the drum (17) of the forced-circulation steam generator via the separation bottle (25).
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: June 16, 1998
    Assignee: Asea Brown Boveri AG
    Inventors: Erhard Liebig, Christoph Ruchti
  • Patent number: 5687674
    Abstract: A steam power plant for generating electric power has a fossil-fuelled boiler, a water-steam cycle for generating high-tension, superheated steam for a steam turbine, an economizer to transmit heat from flue gas to the feed-water, an air preheater to transmit flue gas heat to fresh air and devices for removing dust, sulphur and possibly nitrogen from the flue gases. In order to optimize heat exchange in the air preheater during operation and reduce the heat loses during start-up of the steam power plant, a heat exchanger system is provided with sections through which recirculated air and a heat vehicle medium flow, in which the section carrying the air is connected on the intake side to the fresh-air outlet of the air preheater and on the outlet side to the fresh-air intake of the air preheater.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: November 18, 1997
    Assignee: Saarbergwerke Aktiengesellschaft
    Inventors: Uwe Johanntgen, Franz Josef Marx
  • Patent number: 5345996
    Abstract: An adjustable, energy saving, high speed, air bubble and water heating system extracts waste heat from the exhaust of a water heater on a swimming pool, hot tub, or spa to heat air and/or water. The use of the waste heat results in accelerated heating of the water and creation of heated air bubbles without any additional heat energy requirements. The temperature of the water and air bubbles is independently controllable via manual controls or automatic thermostat.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: September 13, 1994
    Inventor: Robert H. Druien
  • Patent number: 5293842
    Abstract: A method for operating a system for steam generation includes generating steam from water by indirect heat exchange with hot flue gas, by first preheating condensed water and then evaporating the preheated water at high pressure. The method further includes cooling the preheated water which is already at high pressure, by heat exchange with at least one partial flow of the condensed water, at least in a partial-load range. A system for steam generation, such as in a gas and steam turbine plant, includes a steam generator through which hot flue gas flows. The steam generator has heating surfaces. One of the heating surfaces is a condensate preheater having primary and secondary sides. A heat exchanger is connected downstream of the condensate preheater on the primary side and is connected upstream of the condensate preheater on the secondary side.
    Type: Grant
    Filed: March 16, 1993
    Date of Patent: March 15, 1994
    Assignee: Siemens Aktiengesellschaft
    Inventor: Georg Loesel
  • Patent number: 5097801
    Abstract: A waste energy hot water heater which extracts heat energy through heat exchange with flue gas from a primary heating device is disclosed. The water heater has an easily removable, compact, and simple heat exchanger and a flue gas bypass system to avoid overheating the heat exchanger.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: March 24, 1992
    Inventor: Daniel E. Burns
  • Patent number: 4876986
    Abstract: A compact and maintenance-free means and method of regenerating the sensible heat from flue gases of fossil fuel furnaces by heat exchange through two circular layers of rock beds rotating under two semi-circular mantles with the first mantle applying hot flue gases to the beds and the second withdrawing preheated ambient air needed for combustion by said furnaces. When used for power plant flue gas treatment, layers of acid-resistant pipes containing boiler feedwater are sandwiched between the two rock bed layers to usefully recover the heat units arising from moisture condensation. The enormous water of condensation collects flyash and sulphur dioxide thus removing these pollutants from the stack gases. The heavy rock beds rotate slowly beneath the fixed mantles in a circular, pan-shaped, steel vessel floating on and cooled by a circular pond of water. Friction of rotation is minimal and gas leakage principally prevented by liquid seals. When flue gas temperature rises, as above 600 degrees F.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: October 31, 1989
    Assignee: Energy Conservation Partnership, Ltd.
    Inventor: Arthur F. Johnson
  • Patent number: 4813473
    Abstract: A compact and maintenance-free means and method of regenerating the sensible heat from flue gases of fossil fuel furnaces by heat exchange through two circular layers of rock beds rotating under two semi-circular mantles with the first mantle applying hot flue gases to the beds and the second withdrawing preheated ambient air needed for combustion by said furnaces. When used for power plant flue gas treatment, layers of acid-resistant pipes containing boiler feedwater are sandwiched between the two rock bed layers to usefully recover the heat units arising from moisture condensation. The enormous water of condensation collects flyash and sulphur dioxide thus removing these pollutants from the stack gases. The heavy rock beds rotate slowly beneath the fixed mantles in a circular, pan-shaped, steel vessel floating on and cooled by a circular pond of water. Friction of rotation is minimal and gas leakage principally prevented by liquid seals.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: March 21, 1989
    Inventor: Arthur F. Johnson
  • Patent number: 4738224
    Abstract: Waste heat steam generator for hot, dust-loaded gases under overpressure, with a gas feedline, with a gas exhaust line as well as with heat exchanger elements through which a coolant flows. The gas feedline is conducted inside a gas exhaust line, which opens from above into heat exchanger space which is concentrically arranged in a pressure vessel. The heat exchanger space is open at the lower end and in it the heat exchanger elements are supported. The space between the containment walls of the heat exchanger space and the pressure vessel wall at the upper end of the pressure vessel is connected to the gas exhaust line. The pressure vessel bottom in the form of a funnel is connected to an ash removal device. The containment walls of the heat exchanger space are provided with heat exchanger tubes.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: April 19, 1988
    Inventors: Hermann Bruckner, Winfried Ganzer
  • Patent number: 4703794
    Abstract: A compact and maintenance-free means and method of regenerating the sensible heat from flue gases of fossil fuel furnaces by heat exchange through two circular layers of rock beds rotating under two semi-circular mantles with the first mantle applying hot flue gases to the beds and the second withdrawing preheated ambient air needed for combustion by said furnaces. When used for power plant flue gas treatment, layers of acid-resistant pipes containing boiler feedwater are sandwiched between the two rock bed layers to usefully recover the heat units arising from moisture condensation. The enormous water of condensation collects flyash and sulphur dioxide thus removing these pollutants from the stack gases. The heavy rock beds rotate slowly beneath the fixed mantles in a circular, pan-shaped, steel vessel floating on and cooled by a circular pond of water. Friction of rotation is minimal and gas leakage principally prevented by liquid seals. When flue gas temperature rises, as above 600 degrees F.
    Type: Grant
    Filed: July 15, 1986
    Date of Patent: November 3, 1987
    Assignee: Energy Conservation Partnership, Ltd.
    Inventor: Arthur F. Johnson
  • Patent number: 4702226
    Abstract: A preheater for a conventional gas-fired water heater having an outer container, an inner reservoir, water conduits in fluid communication with the reservoir and openings in the outer container allowing the through passage of hot exhaust flue gas from a conventional hot water tank to have an increased residence time with respect to the reservoir for efficient heat transfer of the hot flue gases. The heated water is fed from the preheater to the hot water tank on demand. The preheater is placed atop the hot water tank to receive the hot flue gases therefrom.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: October 27, 1987
    Inventor: Delwyn J. Shelley
  • Patent number: 4693213
    Abstract: A waste heat recovery boiler for a turbine including two denitrating devices disposed in the boiler to reduce the NOx concentration in an exhaust gas below a pre-determined value even when a turbine load changes. The overall denitration efficiency distribution of the boiler with respect to the turbine load can be set arbitrarily by selecting suitable positions of the denitrating devices and the amounts of a catalyst, and any adverse effects resulting from the change of the turbine load can be avoided.
    Type: Grant
    Filed: March 19, 1986
    Date of Patent: September 15, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Eiji Yanai, Tetsuzo Kuribayashi
  • Patent number: 4653434
    Abstract: An automatic water heater system having, contained in a tank, a plurality of vertically extending spiral flame tubes surrounded by substantially vertically extending heat tubes which join the top ends of the spiral flame tubes to form a common exhaust outlet for both sets of tubes, thereby greatly increasing the surface area contact between the water and transfer medium. The heat tubes are especially designed to provide an outlet drain for possible condensation that can develop so as not to drain out through the flame tubes and onto the flame. A heat trap, to capture heat from the hot flue gases otherwise lost by normal passage up through the chimney, may be provided, as well as a blower in the exhaust outlet. The above described structure can be assembled either as a combination heating and storage tank in a single unit, or as a separate component heating unit connected to the storage tank located alongside it.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: March 31, 1987
    Inventor: Robert O. Wilhelm, Jr.
  • Patent number: 4641606
    Abstract: A furnace having a fire box at one end of a multi-unit cell boiler receives combustible refuse and delivers hot combustion gases through passages between water cells of the multi-unit cell boiler. The combustion gases enter an exhaust stack at the far end of the boiler after giving up most of their contained heat to the water circulating through the cells. Simultaneously, water flows through the base of the boiler on a circuitous path from its end adjacent to the exhaust stack toward the furnace and through cooling walls of the furnace and then through a holding tank to a pump which delivers the water to a header communicating with the cells of the boiler unit most distant from the furnace. The water being pumped into the cells is preheated to boost the thermal efficiency of the boiler. Steam generated in the boiler enters a steam header connected with the cell boiler unit nearest the furnace.
    Type: Grant
    Filed: February 26, 1986
    Date of Patent: February 10, 1987
    Assignee: Delta Salvage Energy, Inc.
    Inventor: Alfred L. Roberts
  • Patent number: 4638765
    Abstract: A gas turbine heat recovery system that can be used in steam reforming plants is disclosed. The system utilizes a high pressure steam superheater and a high pressure feedwater heater to recover the heat from the exhaust gas turbine.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: January 27, 1987
    Assignee: Foster Wheeler Energy Corporation
    Inventor: Geoffrey F. Skinner
  • Patent number: 4617878
    Abstract: In a steam generating system, steam condensate extracted from steam used to reheat boiler water in heaters (H1, . . . , H4) is revaporized in the recuperators-vaporizers (RV1, . . . , RV3) by heat exchange contact with the flue gas from boiler (B). The steam thus formed is recycled to contribute to the reheating of the water fed to the boiler.
    Type: Grant
    Filed: July 22, 1985
    Date of Patent: October 21, 1986
    Assignee: Engetra S.A.
    Inventor: Andre J. Paquet
  • Patent number: 4530311
    Abstract: The present invention relates to a waste heat boiler construction where the convection chamber (5) of the waste heat boiler is located on essentially lower level than the radiation chamber (2). In order to lower the end of the radiation chamber (2) gradually onto the level of the convection chamber (2), into the radiation chamber are placed walls (1) essentially in transversal direction to the gas flow, which walls at the same time divide the radiation chamber into separate sections. In order to profitably conduct the gas flow in the radiation chamber, the roof of the radiation chamber (2) is provided with panels (3) located in the gas flow direction, so that the gas flows from the previous section are divided roughly into two by means of the panels (3) of the following section.
    Type: Grant
    Filed: March 8, 1983
    Date of Patent: July 23, 1985
    Assignee: Outokumpu Oy
    Inventor: Tarmo K. Mantymaki
  • Patent number: 4512288
    Abstract: A heat recovery system recovers heat from flue gases from a furnace or the like and a hot water cylinder. Flue gases are passed through series of chambers in which coils are located. Water is passed through the coils in a direction opposite to flue gas flow to maximize heat transfer and the heated water is passed to either a heat radiating system or into preheater tank for the hot water supply. The coils for the heat radiation and water heating are in separate circuits and the flue gases from the hot water is passed only over the coil used for water heating. Pumps are used for water recirculation in both the heat radiating circuit and the water heating circuit. The system has application to domestic and industrial furnaces which provide gaseous combustion products with recoverable thermal energy and permits the use of a small diameter exhaust vent without adversely affecting the ignition and combustion system of conventional furnaces.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: April 23, 1985
    Inventor: Roger Michaud
  • Patent number: 4489679
    Abstract: A once-through steam generator has both radiant and convection sections. The flue gases discharged from the convection section are passed through a wet scrubber to remove both sulfur oxides (SO.sub.x) and particulate matter. The feedwater to the convection section has its temperature controlled by the temperature of the flue gases discharged from the convection section, reducing the temperature of the feedwater by the use of a feedwater exchanger, as the convection section progressively fouls due to particulates in the flue gases. An additional heat exchanger upstream of the feedwater exchanger and convection section which scavenges additional heat from the wet scrubber liquids while the temperature of the flue gases into the scrubber are lowered to a temperature equal to or less than the water dew point temperature of the flue gases entering the scrubber.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: December 25, 1984
    Assignee: Combustion Engineering, Inc.
    Inventor: Fletcher O. Holt
  • Patent number: 4485746
    Abstract: An energy recovery system for an incinerator. Hot flue gases from the incinerator are discharged into a vertical stack and the lower end of the stack is connected through an auxiliary conduit to a heat exchanger, such as a steam or hot water boiler. An induced draft fan draws the hot flue gases through the conduit and boiler to generate steam or hot water and a damper is located within the conduit. A fuel burner is connected in the conduit and operates to supply heat to the boiler during periods when the incinerator is not operating. A first flow sensing mechanism is located in the conduit upstream of the boiler, while a second flow sensing mechanism is positioned in the stack downstream of the connection of the stack and the conduit.
    Type: Grant
    Filed: November 18, 1983
    Date of Patent: December 4, 1984
    Assignee: Kelley Company, Inc.
    Inventor: Kjell I. Erlandsson
  • Patent number: 4407237
    Abstract: An economizer construction for use in recovering heat from flue gases is disclosed including a housing with a flue gas passage therethrough, a helically wound heat transfer coil positioned in the flue gas passage for placing a heat transfer fluid in a heat exchange relation with the flue gases passing through the flue gas passage where the heat transfer coil defines a generally vertically extending central opening therethrough, and a soot blower assembly with an elongate soot blower lance rotatably mounted in the coil central opening for directing a pressurized cleaning fluid over the heat transfer coil to periodically clean it. Different embodiments of the rotary mounting of the soot blower lance are disclosed. Also, different embodiments of the drive means for rotating the soot blower lance are disclosed.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: October 4, 1983
    Assignee: Applied Engineering Co., Inc.
    Inventor: John H. Merritt, Jr.
  • Patent number: 4389980
    Abstract: A boiler has a chamber to contain a charge of wood that rests on the bottom of the chamber with the major portion of the charge within a water jacketed upper portion of the chamber but free to settle as combustion progresses. Combustion is confined to the bottom portion of the chamber due to the cooling effect of the water jacket and to a turbulent cross draft in the combustion zone. A special venturi section in the flue coupled with a pressure blower both induces the flow of hot gases from the combustion zone through a second chamber and a heat exchanger and also provides a stream of air from the venturi section to create the cross draft. An oil burner may be used in conjunction with the second chamber as an alternate heat source. The boiler also has a special base construction and assembly features.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: June 28, 1983
    Assignee: Dumont Industries
    Inventors: Richard P. Marcotte, John W. Dumont, Jr.
  • Patent number: 4374506
    Abstract: An automatic flue gas heat recovery system for supplementing or replacing a conventional, separate hot water system. In the example described, the heat recovery system is applied to a pizza restaurant where large quantities of heat energy are normally wasted up an oven chimney stack, and large quantities of hot water also are required for restaurant operations. An electric motor driven pump circulates water in a closed loop between a storage tank and a heat exchanger tube located in the oven chimney stack. A thermostat control automatically starts the pump when the oven heats the chimney stack to an effective water heating temperature. When temperature in the storage tank reaches a predetermined maximum, the thermostat control stops the pump, opens a drain valve, and dumps water quickly and completely from the heat exchanger tube. Three different embodiments are shown and described illustrating systems with one or more storage tanks and one or more pumps.
    Type: Grant
    Filed: September 18, 1981
    Date of Patent: February 22, 1983
    Inventor: Daniel A. Whalen